Korky Toilet Fill Valve for TOTO G-Max & Power Gravity — 528T Black, Tool-Free Install, Adjustable Height

The Korky 528T is a direct-replacement toilet fill valve engineered to restore reliable refilling and quiet operation in TOTO G-Max and Power Gravity toilets.

If your TOTO toilet is slow to refill, runs between flushes, or makes loud refilling noises, the Korky 528T offers a simple swap-in solution. Made in the USA, this replacement unit adjusts to fit a wide range of tank heights and arrives with all necessary parts for a tool-free installation. The valve is designed to reduce noise and help stop common fill-valve problems without replacing the entire toilet.

How does this valve fix a running or slow-refilling TOTO toilet?

The 528T replaces worn or failing stock fill valves that cause continuous water flow or delayed refilling. Its internal design controls the inlet flow more reliably than older ballcock-style units, which reduces the chance of running. Many users notice immediate improvements in refill speed and quieter operation after installation.

• Replaces TOTO G-Max and Power Gravity factory fill valves.
• Stops continuous running by restoring proper shutoff action.
• Improves refill speed and reduces refilling noise.

Is installation truly tool-free and how adjustable is it?

Yes—installation is designed for homeowners and pros alike without specialty tools. The twist-lock height adjustment lets you set the valve from 7-3/4" to 13-1/2" to match the tank depth. The package includes the mounting nut, cone washer, coupling nut and a tamper-proof key so you can complete the replacement quickly.

• Twist-lock mechanism for easy height adjustment.
• Fits tanks between 7-3/4" and 13-1/2" tall without cutting or extra parts.
• Includes all hardware: refill tube, metal clip, nuts, washer, and tamper key.

Will this valve fit my older or modern TOTO toilet models?

The 528T was developed specifically to match the sizing and connection style of TOTO G-Max and Power Gravity toilets, including many older builds. While it targets those TOTO lines, its adjustable height and standard coupling make it compatible with many similar gravity-fed tanks. Always check your tank’s refill inlet and mounting hole style if you have an unusual or proprietary model.

• Designed for G-Max and Power Gravity TOTO toilets.
• Adjustable to accommodate a wide range of tank sizes and ages.
• Standard coupling fits typical fill valve connections used in gravity toilets.

What’s included in the box and what materials are used?

The kit includes a complete fill-valve assembly and the small parts needed for a secure installation. Korky uses durable materials, including long-lasting chlorazone red rubber seals, for reliable performance and fewer repeat repairs. The refill tube and metal clip ensure correct bowl refill after each flush.

• One 528GT fill valve assembly and refill tube with metal clip.
• Mounting nut, cone washer, coupling nut, tamper-proof key, and instructions.
• Durable chlorazone red rubber components for extended service life.

Who is this for? The Korky 528T is ideal for homeowners, maintenance staff, and plumbers repairing TOTO G-Max or Power Gravity toilets who want a reliable, quieter, and easy-to-install fill valve. It’s a practical upgrade for older toilets showing running issues or noisy refilling, and for anyone who prefers a replacement made in the USA with comprehensive installation parts included.